Electric cord-reel construction



References Cited UNITED STATES PATENTS United States Patent AdolphMelettl Philadelphia, Pennsylvania 21] AppLNo. 746,516

X X 2222 2H2 1 "9H 9 9 .l l nimnu s" meme" k m m n m aea TBTM 8305 45669999 1111 III, 6885 039 0613 1 9 3782 4448 2223 a m e m A II o n 0 m wIn 0 C a 8 m k %9 11C i 4 m 2 w .w e o JNv d e n duk eels fla s FPA 41:1] 253 247 [:lzl

Primary Examiner-Arthur L. LaPoint Assistant Examiner-George H. LibmanAttorney-McClure, Weiser & Millman ABSTRACT: A spring powered electriccord reel includes two plastic hub-and-flange members, one of which forman electrical chamber open at both ends and the other of which forms aspring chamber open at the outer end and closed at the inner end, theabutting edges of the hubs being integrally radially 26 2m 1] M. 9 m

Philadelphia, Pennsylvania a corporation of Pennsylvania [541 ELECTRICCORD-REEL CONSTRUCTION 12 Claims, 19Drawlng Figs. [$2] \U.S. CL...

keyed to each other. A contact carrying electric core tits in theelectric chamber, abutting a core-retaining flange on the 242/ i 18.4,outer edge of the electric chamber, keying the closed'inner 1'] 8.7,77.3, 77.4,100; l9l/i2.2, 12.4; 267/156 end of the spring chamber.

Patented Nov. 24, 1970 Fig. 4; INVENTOR.

ADOLPH MELETT/ A TTORNE Y Patented Nov. 24, 1970 3,542,172

7 Sheet 3 of 5 Fig.5

i W Z INVENTOR.

ADOLPH MELETT/ ATTORNEY Fig.8.

Patented; Nov.24,1970' I. 4 2172 1:

Sheet 3 of 5 INVENTOR ADOLPH MELETT/ ATTORNEY Patented NOV: 24, 19703,542,172

' Sheet 1- of 5 INVENTOR. ADOLPH MELETT/ A T TORNE Y Fig. /6.

Pat 'ente d Nov.24, 1910 I j 3,542,172

Sheet 5-; 0: 5

Fig. l9.

INVEN'I'OR. ADOLPH ME'LETT/ A TTORNEY 1 ELECTRIC CORD-REEL CONSTRUCTIOISThe present invention relates to spring-retracting electrical cord reelsfor use with drop lights and extension lights, and for use as extensioncords for electrically operated tools and appliances, and the object ofthe present invention is a cord reel construction with goodelectrical-insulating characteristics, good fire-resistancecharacteristics and good strength characteristics and which can bemanufactured and assembled more efficiently, with fewer operations andat a cost lower than the now conventional electric cord reels.

The following is a brief description of the accompanying drawings, inwhich like reference characters indicate like parts; these drawingsbeing on a scale approximately full size of the embodiment shown,excepting the Figs. whose different scale is stated hereinbelow.

FIG. 1 is a perspective view of a cord reel representing one embodimentof the present invention.

FIG. 2 represents an elevational view of the same, as viewed parallel tothe cord-retaining flanges of the reel.

FIG. 3 represents anelevational view on line 3-3 of FIG. 2', showing theflange of the electrical-chambered hub-and-reel member showing theelectrical brush block and dust-barring disc in operative juxtaposition.to such hub-and-flange member.

FIG. 4 represents an elevational view of the inner face of thedust-barring disc and of the electrical brushes; and showing the brushblock behind the dust disc in dotted lines.

FIG. 5 represents a cross-sectional view generally on line 5-5 of FIG.1, and more particularly on line 5-5-of FIG. 12; this view being on ascale which is approximately twice the actual size of the embodimentshown.

FIG. 6- represents an elevational view of the electric-chamberedhub-and-flange member 1-, partly in section, to show that its hubportion is open at each of its ends or faces and to show thecore-retainingflange at the outer face of the electrical chamber withinsuch hub portion thereof.

FIG. 7 represents a similar elevational view of the springchamberedhub-and-flange member 2, showing that the spring chamber therewithin isopen at its outer face and closed at its inner face, and also showingone of the three rivetlike plastic projections by which thespring-enclosing disc may be secured to the hub portion thereof (in lieuof a screw or rivet extending through both hub portions 3 and 4 asindicated in FIG. 5).

FIG. 8 represents a plan view of the outer anchor end of thecord-winding spring.

FIG. 9 represents a fragmentary cross-sectional view on line 9-9 of FIG.5, showing the manner in which the doubleheaded rivetlikespring-anchorage member is inserted into the hub portion 4 of thespring-chambered hub-and-flang'e member 2.

FIG. 10 is an elevational view of the electrical core within theelectric-chambered hub-and-flange member;'the hub-andflange member beingshown in dotted lines.

FIG. 11 is an elevational view of the spring-chambered huband-flangemember, showing the location of the spring-- .anchorage slot in the hubportion thereof and showing the hub-orienting dowel pin and the threeelectrical-orienting projections carried by said hub portion.

FIG. 12 represents a view of the inner face of the hub-andflangemember-2 shown in FIGS. 5, 7 and 11, viewed on line l'2-12ofFlG. 11.

FIG. 13 represents an elevational view of the inner face of theelectrical core, viewed on line 13-13 of FIG. 10.:

FIG. 14 represents an elevational view of the outer face of theelectrical core and of the collector rings thereof, viewed on line 14-14ofFIG. l0.

FIG. 15 represents a vertical cross-sectional view of thespring-chambered hub-and-flange member 2, viewed, generally on line15-15 of of FIG. 12, showing the spring-enclosing disc thereon and oneof the integral plastic rivets securing said disc to the hub portion ofsaid hub-and-flange member.

FIG. 16 represents a side elevational view of the springchamberedhub-and-flange member 2, viewed generally on line 16-16 of FIG. 15-l5oron line 16-16 of FIG. 5.

' FIG. 17 represents an elevational view of the inner face of theelectrical-chamberedhub-and-flange member I, viewed generally on line17-17 of FIGS. 5 and 6.

FIGS. 18 and 19 represent perspective views of the inner facesof thehub-and-flange members 1 and 2, respectively, shown with their rivetholes and other orienting elements thereof in operative alinement witheach other.

The cord reel of the present invention includes a cordstorage sheavecomprising two moulded plastic hub-andflange flange members or sheavemembers designated generally by the numbernumerals 1 and 2, comprisinghollow cylindrical hub portions 3 and 4, respectively, and coaxialcircular disc-shaped flange portions 5 and 6, respectively, and coaxialoutwardly flared connecting portions 7- and 8 between the hub portionsand their respective flange portions; the hub portion, the flange andthe intervening flared connecting portion of each member (1 and 2) beingformed integrally with each other.

The two separate sheave members (1 and 2) abut each resiliently flexedin an axial direction without danger of breakage, and will spring backto their original position shown in FIG. 5, after the removal of theflexing or impact force. The

, intervening connecting portions 7 and 8 and the flanges 5 and 6 aretapered in cross section so that the wall thickness thereof graduallydiminishes in a radially outward direction, from the inside to the outerperiphery, thereby enhancing such breakage-resistant axial resiliency.

In the present embodiment of my cord reel, the hub-andflangemembers 1and 2 are made of a generally nonflamrnable high-impact thermoplasticstyrene having a melting point or injection-moulding temperature of thegeneral order 205F. (more or less). Union Carbides No. TMDE-S 161high-impact styrene, and Dow-Cornings No. 492 high-impact styrene areexamples of such plastics. It is to be understood that other resilientmouldable thermoplastic synthetic resins having relatively high impactstrength may also be used.

The interior of the hub portion 3 constitutes a shallow cylindricalelectric chamber 9, at whose outer end a slight inwardly extendingintegral annular flange 10 is provided, which serves as a core-retainingflange against which the outer periphery of the electrical core 11 abutswhen inserted into the electric chamber from the inner end thereof, asshown in FIGS. 5 and 18.

The generally cylindrical hub portion 3 is interrupted at 12 to providea cord-passage recess or gap 12 between the ends 13 and 14 of the hubportion 3, formed by such interruption. Through this gap 12 in thecylindrical hub portion 3, the electrical cord 15 passes in a somewhattangential direction from the core 11 in the interior of the hub portion3 to the outside thereof, where it will be wound around the hub portion3 and the adjacent hub portion 4. v

The electrical core 11 is moulded of a relatively nonresilient andrelatively hard nonflammable synthetic resin as, for instance, aphenolic resin, containing a substantial proportion of tiller and havinga high melting point and high dielectric strength. The Hooker ChemicalCompanys "Durez" No. 2126 phenolic resin is an example of such resin. Itis tobe understood however that other similar synthetic resin materialshaving the aforementioned characteristics may also be used in formingthe electrical core 11.

A pair of concentric shallow annular grooves 16 and 17 are provided inthe outer face of the electrical core- 11, and flat annular brasscollector rings 18 and 19 are nested in the grooves 16 and 17,respectively, The rings 18 and 19 have electrical terminals 20 and 21,respectively, formed integrally therewith and bent inwardly therefromand extending into and through corresponding holes 22 and 23, whichextend from the respective ring grooves 18 and 19 into the terminalchannels 24 and 25 at the back of the core 11, where the two wires ofthe cord 15 are soldered or otherwise secured to the terminals 20 and 21as shown in FIGS. 13 and 18.

One or more shallow keying holes or dowel holes 26 are formed in theinner face of the core 11, for receiving corresponding dowellike keyingprojections 27 extending from the inner radial wall 28 -of thejuxtaposed hub portion 4 of the hub-and-flange member 2, as shown inFIGS. 5, 10, ll, 12, 13, 18 and 19.

A short blind pilot hole 29 is formed in the hub portion 3, parallel tothe axis thereof, and a corresponding dowellike pilot projection 30 isprovided on the inner face of the wall 28 of the hub portion 4. lnassembling the hub portions 3 and 4 to each other (and so assembling totwo hub-and-flange members 1 and 2 to each other) the pilot projectionor pin 30 is brought into registration with a pilot hole 29 and istelescoped thereinto; such registration and telescoping serving toflxate the two hub portions 3 and 4 in predetermined angularrelationship to each other.

An annular groove 31 of generally V-shaped cross section is provided inthe inner end of the hub portion 4, such groove being concentric withthe axis of the hub portion 4.

A complimentarily cross-sectioned annular rib 32 extends outwardly fromthe inner edge surface of the hub portion 3, and extends into andkeyingly interfits with and nests in the groove 31, when the two hubportions (3 and 4) are assembled to each other. The rib 32 isinterrupted on opposite sides of the pilot hole 29 as well as on theopposite sides of the fastener holes 33 which extend through the hubportion parallel to the axis thereof and which register withcorresponding fastener holes 34 extending through the hub portion 4 whenthe pilot pin or projection 30 is nested in the pilot hole 29.

By means of the pilot projection 30 nesting in the pilot hole 29,whereby the two hub portions 3 and 4 are oriented to each other inpredetermined angular relationship, and by means of the dowelprojections 27 (carried by the wall 28 of the hub portion 4) nested inthe dowel holes 26 in the core. 11, the core 11 is oriented inpredetermined angular relationship to the hub portion 3, so that theoutwardly flared mouth 35 of the cord-nesting groove 36 in the back ofthe core 11 will be in registration with the cord-passage opening or gap12 in the hub portion 3.

A rivet or screw 37, having a preformed head 38, is extended througheach pair of alined through holes 33 and 34 and through thecorresponding alined holes 39 in the springenclosing disc or plate 40which is snugly nested in the shallow annular recess 41 in the outerface of the hub-and-flange member 2 as indicated in FIGS. 5 and 15. Theother end of each rivet 37 may be hollowed by means of a short blindaxial hole therein, and the resultant outer tubular end flared out toform a flared head 42 engaging the outer surface of the springenclosingplate 40, or the element 42 may be a nut, where the element 37 is ascrew, thereby permanently or removably affixing the two hub-and-flangemembers (1 and 2) to each other and likewise permanently affixing thespring-enclosing disc 40 to the hub-and-flange member 2. The positionsof the head 38 and riveted head (or nut) 42 may be reversed from theirpositions shown in FIG. 5.

The spring-enclosing disc 40 may be formed of sheet metal or of asuitably hard and relatively nonbreakable impregnated fibrous materialor synthetic plastic material. The disc 40 is provided with centralopening 43, at which the material of the disc is flared outwardly,thereby increasing the axial dimension or length of the hole 43. Thehole 43 is journaled on the journaling portion 44 of the stationaryelectrically-insulating arbor 45 formed of nylon or the like, suchjournaling serving as one of the two bearings revolvably supporting thetwo huband-flange members 1 and 2 and the electrical core 11 on thearbor 45; the other bearing being formed by journaling the central hole46, which extends through the core 11, on the journaling portion 47 andof arbor 45.

The spring-winding portion 48 of the arbor 45 is provided with a slot 49extending parallel to its axis and in the plane which is tangent to acylinder substantially smaller than the outer diameter of'thespring-mounting portion 48, so that the acute-angle lip of the slot willface in the direction opposite to that in which the this spring is woundabout the arbor. The inner end of the spring 50 is bent at acorresponding acute angle to form a hooklike anchoring tab, and suchanchoring tab is slipped into the slot 49, thereby to anchor the innerend of the spring to the arbor.

The outer end 53 of the spring 50 is provided with a slight inclinednotch 54 extending inwardly from the inner edge of the spring, wherebythe outer end 53 of the spring 50 can be hooked onto the inner end ofthe double-headed rivet 55, beneath the inner head 56 thereof. A slot 57extends into the hub portion 4 from the inner face of said hub portion.The central part of the slot 57 is of a width just slightly greater thanthe stem or the body of the rivet 55, while the radially inward and theradially outward ends of the slot are enlarged as at 58 and 59, toaccommodate the inner head 56 and the outer head 60 of the rivet 55. Bythis means, the spring 50 in the spring chamber within the hub portion4, is wound up as the cord is paid out from the hub (3 and 4) betweenthe flanges 5 and 6, by pulling the cord manually and whereby the sowound spring will rotate the two hub-and-flange members.(l and 2) in theopposite direction to rewind and retract the cord.

A dished or shallow cup like ratchet housing 61 may be secured (byrivets or crimped tabs or the like) onto the springenclosing disc 40.Such dished or shallow cuplike member 61 may be formed of sheet metal orother suitable material. Within the cuplike housing 61, any conventionalor other reellocking-and-releasing mechanism may be provided, foroptionally locking or latching the revolvable portions of the reel(including the hub-and-flange members 1 and 2) in any cordpay-outposition and for releasing such revolvable portions of the reel so as tocause the rewinding and retraction of the cord on the hub (3 and 4)under the influence of the spring 50. Such mechanism generally includesa stationary notched disc or ratchet disc stationarily affixed to thestationary arbor 45 and one, two or more pawls pivotally mounted on therevolvable disc 40 in operative juxtaposition to the ratchet disc andarranged optionally to engage a notch or tooth in the periphery of suchratchet disc or to be retracted therefrom. Such mechanisms may be eitherof the positive-action type in which the pawls are urged into thelocking position by a spring or springs, or they may be of the gravitytype in which the pawls are urged into their locking position by gravityand are kept out of their locking position by centrifugal force. For aconventional positive-action type of locking-and-releasing mechanismreference may be had to my US. Pat. No. 2,391,840.

Slight ribs 63 and 64 may be provided on the outer cylindrical surfacesof the hub portions 3 and 4, respectively, extending generally parallelto the axis thereof, to facilitate the rapid assembly of the twohub-and-flange members (1 and 2) to each other. These ribs arepreferably placed in alinement with the pilot hole 29 and the pilotprojection 30, so that the assembler can quickly turn the twohub-and-flange members (1 and 2) with respect to each other until thesetwo ribs 63 and 64 are in line with each other, in which position thedowel pin or pilot 7 projection 30 can be telescoped into the pilot hole29.

The inner surface of the radial wall 28 of the hub portion 4 is providedwith a shallow recess 65, in operative alinement with the channelportions or grooves 24 and 25 in the electrical core 11 and the electricterminals therein, when the dowel projections 27 (extending from thewall 28 of the hub portion 4) are inserted or nested in the dowel holes26 in the electrical the arbor may freely pass.

from the other hub portion.

"-flange member 2-and secure member 1 by providing only the throughholes.34 in the hub portion 4, and forming alined blind holes of asuitably smaller diameter in the hub portion 3, and then extendingheaded the otherwise exposed electrical terminals 22 and 23 and the bareends of the wires soldered thereto, are enclosed by the sheet 66; andthe wall 28 which is formed of relatively low melting point plastic isinsulated and shielded from the otherwise bare electrical parts.

i The stationary arbor 45 is stationarily supported either at one of itsends or at both ends thereof, by any suitably mounting bracket, which,in the embodiment shown, in a generally U-shaped mounting bracketdesignated generally by the numeral 67 and having legs 68 and 69. One orboth outer ends of the arbor are reduced in diameter and provided withone or a pair of opposite flats, and the holes 70 and the legs 68 and 69of the brackets 67 are correspondingly shaped with one or a pair offacing flats, so that when the reduced diametered ends 71 and 72of thearbor 45 are inserted into these holes, the arbor will thereby be lockedagainst rotation in relation to the mounting bracket 67; Headed screws73 and 74 are threaded into axial holes in opposite ends of the arbor45, with their heads overlapping the bracket legs 68 and 69, therebyfirmly holding the bracket and the revolvable portions of the reel toeach other.

The brush-mounting insulating block 75 has a dowel projec- I tion 76thereon which extends into a corresponding hole in the bracket 67, andcarries sets of brushes 77 and 78, operatively bearing against thecollector rings 18 and 19, respectively; the brush block 75 having aclearance hole therein through which Instead of providing the throughholes 33 and 34 (in the hub portions 3 and 4) and the screws or rivets37 therethrough, for

securing the two hub-and-flange members (1 and '2) to each other and forsecuring the spring-enclosing disc 40 to the huband-flange member 2, Imay adhere the meeting surfaces of the hub portions 3 and 4 to eachother and form on the huband-flange member-2 small integral rivetlikeprojections 80 at the same location as those at which the through holes34 would be, and telescope the corresponding holes 39 in the disc 40over these projections (80) and then apply heat and pres,-

,sure to the ends of these projections 80 (by means of flatended heatedrods) until they are spread out or form heads, 6 with the spread-outheadlike portions of the projections 80 overlapping the outer surface ofthe disc, thereby forming rivetlike securements between thehub-and-flange member 2 and the disc 40, though by means of rivetlikeportions 80 formed integrally with and of the same plastic as thehub-andflange member 2, as shown in FIGS. 7 and 15.

Instead of using the through holes 33 and 34 and rivet 37 I may cementor fuse the two adjacent edge surfaces of the hub portions 3 and 4toeach other, including the surfaces of the groove 31 in one of the hubportions and the rib 32 projecting 1 may secure the disc 40 to thehub-andthe latter to the hub-and-flange Alternatively,

screws first through the holes 39 in the disc 40 and then through theholes 34 in the hub portion 4, with the ends the chamber 9 towards andagainst the core retainer flange @10), I may mould the sheave member 1around the core 11, by placing the preformed core 11 in an appropriatemould for the 1 sheave member 1, and then injection moulding (orotherwise moulding) the sheave member 1 in such a mould. In somouldlower melting point or moulding point of the sheave plastic permitsthe sheave 1 to be moulded around the core 11 without softening orotherwise adversely affecting the core 11. An electric-protectiondust-barrier or intrusion-barrier disc 81, of a thin, resilientdielectric material is operatively mounted to the brush block so thatthe outer annular peripheral portion thereof is held in operativejuxtaposition to the annular surface 82 of the sheave member 1 and sothat it may bear lightly thereagainst. The brushes 78 and 79 prevent thedisc 81 from rotating.

' The cord reel of the present invention is durable and has highelectrical insulating characteristics, and its components can bemanufactured at low cost and can be assembled quickly and with theminimum number of operations and at low cost.

The electrical insulating characteristics of the electrical cord reel ofthe present invention are further enhanced by core 11 is inserted intothe electrical chamber 9 of the sheave member 1; thereby simplifying andreducing the cost of the manufacture of the cord reel.

My novel cord-reel construction also effects further economy inmanufacture by making it possible to adhere or fuse the two hub portions3 and 4 to each other simultaneously with the securement of thespring-closure disc 40 to the sheave member 2-shown in FIG. 15, namely,wherein the disc 40 is secured by integral plastic rivets 80. Thus, byapplying a'sol vent or an adhesive to the meeting edge surface of thetwo hub portions 3 and 4, and pressing them together simultaneously withthe application of three heated plungers to the three plastic rivets80,the final securement of the two hub portions to each other and thesecurement of the spring-closure disc 40 can be effected simultaneously.

Iclaim:

1. A-spring wound electric cord reel including an arbor, a

cord-storage sheave revolvably mounted on said arbor and formed of twoplastic sheave members, each sheave member including a generallycylindrical hollow hub portion and an integral cord flange extendingradially outwardly from the outer end of the hub portion, the hollow hubportion of one of said plastic sheave members constituting an electricalchamber and the hollow hub portion of the other plastic sheave memberconstituting a spring chamber, said generally cylindrical electricchamber being open at both ends thereof prior to the assembly of the twohub-and-flange members to each other and said generally cylindricalspring chamber being open at its outer end and closed at its inner endby a round disclike wall whose outer periphery is integral with theinner end of the generally cylindrical spring-chambered hub-portion,andsaid disclikeinner wall of the spring chamber forming a closure forthe inner end of the electric chamber when the two sheave members areassembled to each other, a plastic electrical core disposed within saidelectric chamber and carrying two outwardly facing electricalsweep-contracts, means retaining said electrical core againstdisplacement in an axially outward direction in relation to saidelectrical-chambered sheave member when the latter is assembled to theother sheave member, a cord-winding spring operatively mounted withinsaid spring chamber and having its inner end anchored to its hubportion, means fixing the angular orientation of said electric core inrelation to its sheave member, a closure disc secured to the flange endof said spring-chambered sheave member and closing the outer end of thespring chamber thereof, said electrical core and said spring-closingdisc having coaxial journal holes therein, said stationary arbor havinging the sheave member 1 around the preformed core 11, the 75 journalportions inoperative juxtaposition to the aforementioned journal holesand having an intermediate springanchorage portion and having means atleast at one end thereof for stationarily securing the arbor to astationary support, a stationary contact-carrying dielectric block inoperative juxtaposition to said electrical sweep contacts carried bysaid electric core, and stationary electric sweep contacts carried bysaid dielectric block in operation position to said corecarried sweepcontacts, and an anchor receiving slot in the hub portion of thespring-chambered sheave member, extending generally parallel to the axisthereof from the inner face of such hub portion to a point between suchinner face and the outer end of the hub portion, a headed springanchorage interlockingly disposed in said slot and having a head thereofextending into the spring chamber, and an notch in the outer end of thecord-winding spring, such notched spring end being hooked onto saidspring anchorage between said head thereof and the inner cylindricalwall of the spring chamber.

2. An electric cord reel according to claim 1, including keying meansintermediate the two sheave members for keying them to each otheragainst radial displacement in relation to each other.

3. An electric cord reel according to claim 1, in which the electricalcore has a r'earwardly open cord-nesting groove whose outer end isflared outwardly, and in which electrical terminals extend from thecore-carried sweep contacts into said cord-nesting groove, a cordpassage in the hub portion of the electric-chambered sheave member inregistration with said outwardly flared end of the cord groove of thecore, and means maintaining said cord-passage in operative registrationwith the outwardly flared outer end of said cord-nesting groove of thecore.

4. An electric cord reel according to claim 1, including complementarykeying means along the juxtaposed meeting edges of the two hub portions,keying them to each other against radial displacement in relation toeach other.

5. An electric cord reel according to claim 1, in which the arbor isformed of a dielectric plastic having high impact strength.

6. An electric cord reel according to claim 1, including a thin,resilient circular dielectric disc stationarily mounted to saidcontact-carrying dielectric member with an outer annular portion thereofin operative juxtaposition to the electricchambered sheave member andarranged to bar the access of foreign matter to the aforementionedelectric contacts carried by the electric core and by the dielectricblock.

7. An electric cord reel according to claim 6, in which the arbor isformed of a dielectric plastic having high impact strength.

8. In a spring-wound electric cord reel, a pair of complementary plasticmembers each including a generally cylindrical hollow hub portion havinga peripheral wall and a radially extending flange, one of said hubportions including a plastic radially extending inner wall, acord-winding spring operatively mounted in said one hub portion and adielectric core mounted in the other hub portion including collectorrings exposed through the outer face of said core, an electric cordelectrically connected to said rings and extending through an opening inthe peripheral wall of said other hub portion,

means integral with the hub interengageable between said inner wall ofsaid one hub portion and the inner face of said dielectric core to keyand retain the two hub portions in proper assembly, and means connectingsaid hub portions so assembled to provide a sheave member, said hubportions being substantially coextensive and providing when connected asubstantially continuous sheave surface between said flanges formed ofthe two peripheral walls of said hub portions over which said electriccord is wound, said sheave member being adapted for revolvable mountingon a stationary arbor extending axially through said hub portions.

9. The combination of claim 8 wherein said dielectric core issubstantially coextensive with the interior of said other hub portionand press fit therein.

10. The combination of claim 8 wherein said means interengageablebetween said inner wall of said one hub portion and the inner face ofsaid core includes circumferentially spaced axially extendingprojections and recesses receiving them.

11. The combination of claim 8 and a circumferentially extending groovein said dielectric core receiving a portion of said electric cord andopening through the inner face of said dielectric core and communicativewith said opening in said peripheral wall. of said other hub portion.

12. The combination of claim 8 and an insulating disc covering saidouter face of said core including brushes in fixed juxtaposition to saidcommutator rings.

